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             AUSCERT External Security Bulletin Redistribution

                        ESB-2008.0259 -- [Solaris]
            A Security Vulnerability Relating to Inter-Process
            Communication (IPC) May Lead to a Denial of Service
                               13 March 2008

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              kernel
Publisher:            Sun Microsystems
Operating System:     Solaris 10
Impact:               Denial of Service
Access:               Existing Account

Original Bulletin:  
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-231403-1

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Solution Type: Sun Alert
   Solution  231403 :   A Security Vulnerability Relating to
   Inter-Process Communication (IPC) May Lead to a Denial of Service
   (DoS)          
   Bug ID: 6642234

   Product
Solaris 10 Operating System

   Date of Resolved Release: 11-Mar-2008

   SA Document Body
A Security Vulnerability Relating to Inter-Process Communication (IPC) May Lead
 to a Denial of Service (DoS)

1. Impact

   A security vulnerability relating to the Inter-Process Communication
   (IPC) message queue sub-system may allow a local unprivileged user to
   block all I/O on a message queue until the system is rebooted. This is
   a type of Denial of Service (DoS).

2. Contributing Factors

   This issue can occur in the following releases:
   SPARC Platform
     * Solaris 10 with patch 127111-02 through 127111-09 and
       without patch 127111-10

   x86 Platform
     * Solaris 10 with patch 127112-02 through 127112-09 and
       without patch 127112-10

   Note: Solaris 8 and Solaris 9 are not affected by this issue.

3. Symptoms

   IPC message queue I/O (from the perspective of the application) to one
   or more message queues will hang. An attempt to ascertain the state of
   the message queue sub-system with the command
    $ ipcs -qa

   will also hang after the command has output its heading to the screen.
   For further confirmation that this issue has occurred, a system panic
   could be forced when the above symptom was being exhibited, and the
   following command run on the resultant core file:
    
# echo "::walk thread_cache |::findstack !grep msg_fnd_neg_snd" |mdb -k unix.0 vmcore.
    000002a10232eff1 msg_fnd_neg_snd+0xd8()

   This indicates that the kernel function msg_fnd_neg_snd() was present
   on one of the thread stack backtraces which is another symptom that
   this issue has likely occurred.
   Notes:
    1. Care needs to be taken as to when and how a system panic is
       forced; utilities such as 'halt -d', 'reboot -d', or kmdb
       '$<systemdump' may be used for this purpose; however, contact your
       systems administrator or local support center for advice if you
       are in any way unsure about how to proceed with this operation.
    2. By default, crash dumps are written to "/var/crash/<hostname>".
       See dumpadm(1M) for further information.

4. Workaround

   There is no workaround for this issue. Please see the Resolution
   section below.

5. Resolution

   This issue is addressed in the following releases:
   SPARC Platform
     * Solaris 10 with patch 127111-10 or later

   x86 Platform
     * Solaris 10 with patch 127112-10 or later

   For more information on Security Sun Alerts, see Technical
   Instruction ID 213557.
   This Sun Alert notification is being provided to you on an "AS IS"
   basis. This Sun Alert notification may contain information provided by
   third parties. The issues described in this Sun Alert notification may
   or may not impact your system(s). Sun makes no representations,
   warranties, or guarantees as to the information contained herein. ANY
   AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
   WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
   NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
   YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
   INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
   OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
   This Sun Alert notification contains Sun proprietary and confidential
   information. It is being provided to you pursuant to the provisions of
   your agreement to purchase services from Sun, or, if you do not have
   such an agreement, the Sun.com Terms of Use. This Sun Alert
   notification may only be used for the purposes contemplated by these
   agreements.
   Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved

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